Author: Frederic Massart
MDL-42666 repository_boxnet: Advise the user to run the migration tool
http://git.moodle.org/gw?p=moodle.git;a=commit;h=2c1fc0e086424842d0d352eefb897f39e47bac9e
http://github.com/moodle/moodle/commit/2c1fc0e086424842d0d352eefb897f39e47bac9e
+ 2.4 en [migrationadvised,repository_boxnet]